Juniper Networks J4350 - Manual (Page 95)

Preparing for Router Installation
Site Electrical Wiring Guidelines on page 75
Router Power Requirements on page 76
AC Power, Connection, and Power Cord Specifications on page 76
DC Power, Connection, and Power Cable Specifications on page 77
Site Electrical Wiring Guidelines
WARNING: DC-powered J4350 and J6350 Services Routers are intended for
installation only in a restricted access location.
When planning the electrical wiring at your site, consider the factors
discussed in the following sections.
Signaling Limitations
Improperly installed wires can emit radio interference. In addition, the potential
for damage from lightning strikes increases if wires exceed recommended
distances, or if wires pass between buildings. The electromagnetic pulse (EMP)
caused by lightning can damage unshielded conductors and destroy electronic
devices. If your site has previously experienced such problems, you might want
to consult experts in electrical surge suppression and shielding.
Radio Frequency Interference
You can reduce or eliminate the emission of radio frequency interference (RFI) from
your site wiring by using twisted-pair cable with a good distribution of grounding
conductors. If you must exceed the recommended distances, use a high-quality
twisted-pair cable with one ground conductor for each data signal when applicable.
Electromagnetic Compatibility
If your site is susceptible to problems with electromagnetic compatibility
(EMC), particularly from lightning or radio transmitters, you might want to
seek expert advice. Strong sources of electromagnetic interference (EMI) can
destroy the signal drivers and receivers in the router and conduct power
surges over the lines into the equipment, resulting in an electrical hazard.
It is particularly important to provide a properly grounded and shielded
environment and to use electrical surge-suppression devices.
CAUTION: To comply with intrabuilding lightning/surge requirements, intrabuilding
wiring must be shielded, and the shield for the wiring must be grounded at both
ends.
Power Guidelines, Requirements, and Specifications 75